Seems to be pretty readily available on the used market. I can't speak to the quality of this source, but I googled around a little bit and found this:
http://www.musicstack.com/listings.c...e&media=Vinyl7
It seems to be an aggregator of different music retailers.

By the way, if you get a copy with a decent sleeve, it's pretty graphically striking---in a 1973 sort of way, mind you---and might be suitable as part of the display too. (See the Wikipedia entry for an image.)

-NT